fastmcp/docs/development/v4-notes
Jeremiah Lowin d2ac7ed3d2
Default fastmcp.Client to mode="auto"; surface extensions=/result_claims=
Client negotiates the newest mutual protocol era by default (probe
server/discover, fall back to the initialize handshake). ProxyClient and the
inspect utility explicitly pin the handshake era so proxy forwarding and
server_info reads are unchanged. SSE and multi-server config transports are
legacy-only. extensions= and result_claims= (SEP-2133) are thin passthroughs
to the SDK session.
2026-07-19 21:22:49 -04:00
..
change-register.mdx Default fastmcp.Client to mode="auto"; surface extensions=/result_claims= 2026-07-19 21:22:49 -04:00
feature-program.mdx Add guard-mode multi-round-trip tools (SEP-2322) (#4544) 2026-07-19 16:42:06 -04:00
index.mdx Add server-side identity assertion (SEP-990 ID-JAG) (#4483) 2026-07-18 19:52:15 -04:00
known-gaps.mdx Migrate to MCP Python SDK v2 (#4437) 2026-07-06 17:36:45 -04:00
protocol-2026.mdx Default fastmcp.Client to mode="auto"; surface extensions=/result_claims= 2026-07-19 21:22:49 -04:00